So I ordered from GM Gauge repair, their 5mm WHITE LED cubes and replaced them tonight. I can't say that I am pleased by any stretch of the imagination.
This picture I took, makes it look amazing. Trust me it's not and I can't get the phone to adjust to take it as the human eye sees it. I WISH that it were this bright (they're almost the same brightness as the stock bulbs), the needles this radiant, and not as blue as it turned out.
I may investigate gague face overlays without the blue pigmentation on the backside as their simply isn't a ton of cube LED options;
Here is my stock one. Again, the camera makes it look amazing. It really isn't like this. If it were, I wouldn't have changed them. However, you CAN see the kelvin (coloring) difference. I don't want blue'ish. I want white in my trucks. Like I want warm red in my Pontiac's...
Or just use the regular HD truck cluster which is basically the same as the Denali cluster but with regular lighting color and black background. You should be able to swap needles from a standard or HD cluster too if you wanted the other features of the Denali cluster.